1.

A car moving with the speed of 90km/hr. It's driver is his a child in the middle of the road at 200m. Whether he will hit the child or not. If he immediately applies brake and the time is 5 second

Answer»

u = 90km/h = 90 x 5/18 = 25 m/sv = 0 m/st = 5sUsing the First Equation of Motionv = u + at0 = 25 + 5a5a = -25a = -25/5a = -5 m/s^2Using the Third Equation of Motionv^2 - u^2 = 2as- 25^2 = 2 x (-5) x s625 = 10ss = 625/10s = 62.5mNo, the car will not HIT the CHILD as the distance TRAVELLED during deceleration is less than the distance of the child from the car.



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